IP subnet-zero , can a broadcast subnet address be used

in CCNA & CCENT
Hi, In question 1 of the chapter 15 quiz of the CCent ICND1 book, it says that 10.43.53.255 /26 cannot be used as a host address even though the ip subnet-zero command has been configured. Earlier on in the book it says that using the ip subnet-zero command means that the subnet number and the broadcast subnet are not reserved and can be used as host IP addresses. Can anybody clear this up for me?
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Comments
.255 is the broadcast of that subnet range. Although technically you could use it, it isn't recommended because of potential addressing conflicts.